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The Set interface is an important part of the Java Collections Framework and represents an unordered collection of unique elements. It does not allow duplicate elements.

One of the commonly used implementations of the Set interface is the HashSet class. The HashSet class uses a hash-based mechanism to store its elements, providing fast access and retrieval times.

To use the Set interface with the HashSet class, you first need to import the necessary classes:

TEXT/X-JAVA

1import java.util.HashSet;
2import java.util.Set;

Here's an example of using the Set interface with the HashSet class:

TEXT/X-JAVA

1import java.util.HashSet;
2import java.util.Set;
3
4public class Main {
5    public static void main(String[] args) {
6        // Creating a Set
7        Set<String> fruits = new HashSet<>();
8
9        // Adding elements to the Set
10        fruits.add("Apple");
11        fruits.add("Banana");
12        fruits.add("Orange");
13        fruits.add("Mango");
14
15        // Removing an element from the Set
16        fruits.remove("Banana");
17
18        // Checking if an element is present in the Set
19        boolean containsApple = fruits.contains("Apple");
20
21        // Printing the elements in the Set
22        System.out.println("Set: " + fruits);
23        System.out.println("Contains Apple: " + containsApple);
24    }
25}

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import java.util.HashSet;
import java.util.Set;
​
public class Main {
    public static void main(String[] args) {
        // Creating a Set
        Set<String> fruits = new HashSet<>();
​
        // Adding elements to the Set
        fruits.add("Apple");
        fruits.add("Banana");
        fruits.add("Orange");
        fruits.add("Mango");
​
        // Removing an element from the Set
        fruits.remove("Banana");
​
        // Checking if an element is present in the Set
        boolean containsApple = fruits.contains("Apple");
​
        // Printing the elements in the Set
        System.out.println("Set: " + fruits);
        System.out.println("Contains Apple: " + containsApple);
    }
}

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